电催化剂
双功能
析氧
电解
化学
材料科学
化学工程
氢氧化物
无机化学
催化作用
纳米颗粒
纳米技术
电化学
电极
有机化学
物理化学
工程类
电解质
作者
Suraj Gupta,N. Patel,R. Fernandes,S. Hanchate,A. Miotello,D.C. Kothari
标识
DOI:10.1016/j.electacta.2017.02.100
摘要
This work reports, for the first time, Co-Mo-B as a bifunctional electrocatalyst, prepared by a facile reduction method. The optimized catalyst, Co-3Mo-B shows excellent HER performance and achieves 10 mA/cm2 at mere 96 and 66 mV (vs RHE) in pH 7 and pH 14, respectively with good stability (40 hours) and reusability (5000 cycles). Co-3Mo-B catalyst is found to be made up of nano-sized crystalline domains, separated by grain boundaries containing active under-co-ordinated sites. From morphological, physico-chemical and electrochemical analyses, it was found that Co-3Mo-B nanoparticles (NPs) exhibit small size (∼18 nm) with high specific and electrochemical surface area. Under alkaline conditions, Co-3Mo-B can also produce oxygen at meagre overpotentials (10 mA/cm2 at 320 mV) with favourable stability. Bifunctional property is demonstrated by employing Co-3Mo-B in a 2-electrode alkaline cell to execute overall water electrolysis, producing 10 mA/cm2 at just 1.69 V, which is maintained for at least 25 hours of operation. The nature of the catalyst to form Co oxide/hydroxide species on the surface is responsible for good OER performance. The significant activity of Co-3Mo-B makes it the best metal boride bifunctional electrocatalyst reported so far.
科研通智能强力驱动
Strongly Powered by AbleSci AI